Series-parallel system reliability analysis

A school is being designed with three identical building-wide fire alarm systems. The reliability of each fire alarm systems is 0.995.
a. Should the fire alarm systems be placed in series, parallel, or in a series-parallel combination?
b. Defend you recommendation using a system reliability analysis.

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Student,

Series means each alarm is "wired" after the other and if any one fail, all fail in the old "Christmas tree light" scenarion.

In parallel, you only have complete failure (zero alarms) if all fail, as the ...

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This solution of a system reliability analysis considering series and parallel configurations of a fire alarm system includes a background PDF on this subject area and an explicit solution in a spreadsheet with comments.

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